Do tell. Where do you get the batts? What BMS are you using? Do you want to resell? I would volunteer to be logistics and fulfillment if you want.
From: TJ Trout Sent: Wednesday, February 12, 2020 7:19 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs? Guys, every chemistry of lithium battery (lifepo4, li-ion, lto, etc) are available in 1 to 10 KW modules at less than $100 a kilowatt hour most of them test between 70 to 99% of the rated capacity mostly removed from electric vehicles anyways we repurpose them into storage for our equipment you just need a 48 volt BMS to balance the cells and provide low temperature and low voltage protection. On Wed, Feb 12, 2020, 5:50 PM Robert <[email protected]> wrote: They have three problems.. 1) Cost.. Yeah they break the bank. 2) low voltage compared to other chemistries, which means _more_ cost 3) poor efficiency.. You put in 100 watts, you only get 80 watts out. All of this is from listening to Will Prowse.. He has an excellent set of tubes on them... https://www.youtube.com/channel/UCoj6RxIAQq8kmJme-5dnN0Q On 2/12/20 5:33 PM, Steve Jones wrote: these they say are good for subzero charging, thats what appeals to me and that the subzero doesnt affect discharge rate On Wed, Feb 12, 2020 at 6:39 PM Robert Andrews <[email protected]> wrote: Lithiums degrade with temps over 130 degrees F ( depending upon chemistry and if you attempt to charge them below freezing. Failure can result from trying to charge below freezing. Between those extremes they do pretty well. The below freezing is a deal breaker for outside solar. There are manufacturers ( BattleBorn + others ) that are coming out with heaters to get around that. On 02/12/2020 04:21 PM, Mathew Howard wrote: > I'm wondering how well lithiums hold up compared to flooded cells in a > non-environmentally controlled area. I suspect it's worse. > > On Wed, Feb 12, 2020 at 6:20 PM <[email protected] > <mailto:[email protected]>> wrote: > > In my 42+ years of dealing with stationary flooded cells is that you > can > easily get 20+ years from them if they are properly maintained and > kept in > an environmentally controlled area. > > -----Original Message----- > From: Bill Prince > Sent: Wednesday, February 12, 2020 5:04 PM > To: [email protected] <mailto:[email protected]> > Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs? > > I think you would expect at least 2-3 times the life with lithium > (almost all the various chemistries currently in vogue). You can also > increase discharge tolerance to 80-90 percent instead of the usual > lead-acid 50% (or thereabouts). > > I think the cost is still a bit over the top. Maybe another year or two > depending. > > > bp > <part15sbs{at}gmail{dot}com> > > On 2/12/2020 3:47 PM, Ken Hohhof wrote: > > Life also matters. > > > > Half the cost but has to be replaced in half the time would not > be a good > > deal. With my luck, if batteries die after 3 years, I'll have a > big power > > outage every 37 months. And it's not just a cost calculation. > Lugging > > half > > a ton of new batteries out to a tower and then hauling the old > ones back > > for > > recycling sucks. So if someone has battery technology that lasts > 10 or 20 > > years, that's worth a bunch. > > > > -----Original Message----- > > From: AF <[email protected] > <mailto:[email protected]>> On Behalf Of [email protected] > <mailto:[email protected]> > > Sent: Wednesday, February 12, 2020 5:36 PM > > To: [email protected] <mailto:[email protected]> > > Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs? > > > > Charging time doesn't interest me much in a grid backup > situation. The > > cost > > of the battery per watt hour is normally my only consideration for a > > backup > > battery. > > > > -----Original Message----- > > From: Robert Andrews > > Sent: Wednesday, February 12, 2020 4:25 PM > > To: [email protected] <mailto:[email protected]> > > Subject: Re: [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs? > > > > Nice thing about the lithium Iron is any charger that is programmable > > will work. And the faster you can charge them the better. You > think > > flooded times of 2-4 hours and with a big charger the lithium > banks can > > charge at 100amps and 1 hour. > > > > On 02/12/2020 02:06 PM, [email protected] <mailto:[email protected]> > wrote: > >> 21 cents per watt hour. That is not competitive with flooded cells. > >> And what kind of special charger would you have to have? > >> *From:* Peter Kranz via AF > >> *Sent:* Tuesday, February 11, 2020 5:36 PM > >> *To:* [email protected] <mailto:[email protected]> > >> *Cc:* Peter Kranz > >> *Subject:* [AFMUG] Alibaba LiFePO4 48V 200Ah battery packs? > >> > >> Anyone successfully built a telecom UPS solution using rack mount > >> LiFePO4 batteries sourced from china? > >> > >> There seems to be endless arrays of rack mount solutions there: > >> > >> > https://www.alibaba.com/product-detail/48v-100ah-200ah-lithium-ion-bat > >> tery_60844575234.html?spm=a2700.details.pronpeci14.6.7e40675elEWkcL > >> > >> Prices run about 25% the cost of locally sourced LiFePO4 solutions. > >> The selection is crazy however, and who knows what the gotchas are. > >> > >> *Peter Kranz > >> *www.UnwiredLtd.com <http://www.UnwiredLtd.com> > <http://www.unwiredltd.com/> > >> Desk: 510-868-1614 x100 > >> Mobile: 510-207-0000 > >> [email protected] <mailto:[email protected]> > >> > >> > ---------------------------------------------------------------------- > >> -- > >> -- > >> AF mailing list > >> [email protected] <mailto:[email protected]> > >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com > >> > >> > > -- > > AF mailing list > > [email protected] <mailto:[email protected]> > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > > > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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